Doan's is a - relatively - new Vietnamese place way down South Boulevard. If you're in the area, it's certainly worth a stop. The decor is almost non-existent, but that's not really a problem. It's clean, and that is all that matters when it comes to the atmosphere.
It's the food that shines at Doan's. On the downside, the staff isn't that great at helping you if you aren't sure what you want, so you might want to study up before you come in. They are friendly enough, but it's like one of those places that you ask and they tell you that everything is good.
On the good side, everything is solid - just don't look to the staff for help deciding. Prices are also good, and the service is fast too!